Detail is important. The Dozens companies provide packages about traffic details. You can see every factors that its cause of popularity, goals, budget, and vendors. For an examples, you use google analytics. You will get information about traffic, unique visitor, and more...

Clickability – Provides imWare, which includes web-based tools for adding Email This, Save This, and Print This functionality, and then provides stats on each respective tool and how it is being used.

Clickfox – Provides an analytics tool based on “artificial intelligence” technology that makes specific recommendations for your web site with a focus on usability.
Clickstream – Markets Datasherpa Web Analytics to hosting providers.
Coremetrics – Provides analytics software with a focus on delivering information on actual customer behaviors.
DeepMetrix – Provices LiveSTATS analytics software with versions for enterprise users, small business, and ISPs.

Fireclick – Offers analytics package that integrates with paid search engines, e-mail providers, affiliate programs and more in order to provide a consolidated view of all site activity.
Google Analytics – Google’s free analytics software. Includes tight integration with AdWords . Unlike some enterprise apps, the stats are usually on a delay of a few hours.
Hitslink – Around since 1999, offers a Professional and Enterprise version of their web-based real-time reporting package.
iPerceptions – Provides “attitudinal analytic solutions” looking at customer behavior both online and off.
Manticore Technology – Includes Web Analytics as part of their Virtual Touchstone “demand generation” suite.
Maximine – Offers full suite of analytics software to handle privacy, accessibility, site quality, legislative compliance, web standards enforcement and traffic tag validation issues

MetriServe – Web-based analytics solution, also offers gadgets for Windows Vista and Mac OS X to get up-to-date stats on your desktop.
Moniforce – Offers two versions of the webSensor analytics package, Enterprise for high traffic sites and a light version called Commerce.
Mtracking – Dubs itself a “visitor relationship management service” with two different analytics packages.
Nedstat – Offers two analytics products – a more lightweight service called Sitestat and enterprise-focused Nedstat Pro.
SPSS – Provides “Predictive Web Analytics” by providing lists of the visitors most likely to convert.

Omniture – Offers three web analytics products; SiteCayalyst for traffic analysis, DataWarehouse for list generation, and Discover for segmenting large chunks of data.
OneStat.com – Provides a range of analytics packages from small to large web sites, as well as a free counter that anyone can use.
Optimal IQ – Provides Marketing Webtools, along with ClickForensics product for monitoring click fraud.
Quova – Analytics software with a focus on measuring the effectiveness of marketing strategies by geographic region.
SiteClarity – Web analytics with reports in areas including marketing, site optimization, and customer retention.

SiteCounter – Offers free stat tracking of key metrics like visits, page views, and referring source for sites with less than 250,000 visitors per month.
Unica – Offers NetInsight for enterprise-class web analytics and NetTracker, for small and medium businesses or internal sites.
Visual Sciences – Formerly WebSideStory (one of the earlier large web tracking companies), today the company offers the HBX Web Analytics package aimed at high traffic sites.
WebAbacus – Performance and Effectiveness product provides a variety of analysis of designed-focused reports.
WebSTAT – Provides installable client-side analytics package that includes more than 40 canned reports.

WebtraffIQ – Analytics package tracking site traffic, effectiveness of emails, and offline campaigns.
WebTrends – One of the top players in analytics since the early days, the company now offers multiple tiers of software packages for different size businesses and specific industries.
SiteMeter – Provides a basic free tracking service for measuring visitors and page views, and a premium version with more features with pricing based on page views.